1/* ===-- divxc3.c - Implement __divxc3 -------------------------------------===
2 *
3 *                     The LLVM Compiler Infrastructure
4 *
5 * This file is distributed under the University of Illinois Open Source
6 * License. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __divxc3 for the compiler_rt library.
11 *
12 */
13
14#if !_ARCH_PPC
15
16#include "int_lib.h"
17#include <math.h>
18#include <complex.h>
19
20/* Returns: the quotient of (a + ib) / (c + id) */
21
22long double _Complex
23__divxc3(long double __a, long double __b, long double __c, long double __d)
24{
25    int __ilogbw = 0;
26    long double __logbw = logbl(fmaxl(fabsl(__c), fabsl(__d)));
27    if (isfinite(__logbw))
28    {
29        __ilogbw = (int)__logbw;
30        __c = scalbnl(__c, -__ilogbw);
31        __d = scalbnl(__d, -__ilogbw);
32    }
33    long double __denom = __c * __c + __d * __d;
34    long double _Complex z;
35    __real__ z = scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
36    __imag__ z = scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
37    if (isnan(__real__ z) && isnan(__imag__ z))
38    {
39        if ((__denom == 0) && (!isnan(__a) || !isnan(__b)))
40        {
41            __real__ z = copysignl(INFINITY, __c) * __a;
42            __imag__ z = copysignl(INFINITY, __c) * __b;
43        }
44        else if ((isinf(__a) || isinf(__b)) && isfinite(__c) && isfinite(__d))
45        {
46            __a = copysignl(isinf(__a) ? 1 : 0, __a);
47            __b = copysignl(isinf(__b) ? 1 : 0, __b);
48            __real__ z = INFINITY * (__a * __c + __b * __d);
49            __imag__ z = INFINITY * (__b * __c - __a * __d);
50        }
51        else if (isinf(__logbw) && __logbw > 0 && isfinite(__a) && isfinite(__b))
52        {
53            __c = copysignl(isinf(__c) ? 1 : 0, __c);
54            __d = copysignl(isinf(__d) ? 1 : 0, __d);
55            __real__ z = 0 * (__a * __c + __b * __d);
56            __imag__ z = 0 * (__b * __c - __a * __d);
57        }
58    }
59    return z;
60}
61
62#endif
63